1799-D16U16VAGL
1799-D16U16VAGL
1799-D16U16VAGL
控制系统结构
PLC采用罗克韦尔自动化/ AllenBradley ControlLogix控制系统,完成设备的连续集中控制。采用单CPU处理器,处理器选用1756-L61。
各子系统I/O扩展和上位通讯考虑采用符合IEC 61158的开放现场总线ControlNet系统,冗余链路配置。 ControlNet为令牌总线方式的实时控制网,通讯速率5MBit/秒,冗余配置,其上挂接混合型控制器CPM和服务器, ControlNet的传送方式可以保证实时数据何时传送(确定性),并不会因网上节点的增减而改变 (重复性),介质为RG6同轴电缆,BNC连接器,长度可达1km,加扩展器可扩展达6km。ControlLogix 系统为多种类型的控制提供了的控制平台,在这一个平台上,就可以实现顺序控制、过程控制、传动或运动控制的任意组合控制。因为这个平台是模块化的,所以就能够有效地设计、建立和更改平台,地节约了工程实施费用。通过先进的组态工具、内存结构和需要较少编程和内存的符号编程,可以大大提高工程的生产率。内存分为程序区和用户数据区,采用完全的自动内存分配机制,开发人员无需人工分配系统内存,支持灵活的网络结构,无需任何编程或者处理器干预,即可实现不同网络之间的通讯桥接和数据交换。
系统的网络结构如下图所示:每个主排风机有一个独立的控PLC以及 PanelView Plus 1000作为人机界面接口。这些设备以及变频器的PLC通过1756- CNBR模块组成ControlNet网络,这个网络通过烧结主系统的PLC2远程IO站与烧结主系统L1网络连接.变频器(VFD)PLC有一个ControlNet IO网络,两个Point IO 分别控制MB3(Motor1)、MB4(Motor2)的励磁盘,1756-A10框架及20-COMM-C完成变频器本体的控制及数据交换,本地框架主要是高压盘等外围接口状态采集及控制。
由于ControlLogix 系统的开放性及灵活性,可以在烧结L1网络的任意位置通过Drive Executive工具对变频器进行组态及维护,也可以由PLC经由ControlNet 网络通过20-COMM-C模块修改变频器控制参数。这里由于两台马达动态参数有较大的差别,为了达到理想的控制效果,在起动前由PLC写入针对该马达的控制参数。程序如图3所示。
实际上,只要对外围系统进行简单的改造,将来本起动装置可以起动一烧结9300KW直流无刷励磁同步电动机,也可以起动规划中的4000-5000KW的脱硫增压风机,而且可以是任何形式的10KV 高压电动机。系统的开放性在这里得到了充分的体现。
七、改造效果
原有设备拆除,新设备在线安装、调试全部工作在10天内完成,确保了年修节提前36小时完成,实现效益450万元。
新设备运转平稳,静止状态下起动成功率,并网冲击小,频率差 <0.1Hz、电压差 <3%、相位差<3°。
综上所述,起动装置改造性能指标完全达到设计要求,改造取得圆满成功。
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